X-Git-Url: https://vcs.fsf.org/?a=blobdiff_plain;f=CRM%2FUtils%2FMoney.php;h=28ecf6aafe9f662e09461120983c72f3422f77fe;hb=f75dfe2bf044ef5ba83782782d3586205c66f702;hp=555e7db6e41906f19a1c06eda0209e6b303e5982;hpb=e4636fa7912cc7a53ceaf61d4d0edb868a998f54;p=civicrm-core.git

diff --git a/CRM/Utils/Money.php b/CRM/Utils/Money.php
index 555e7db6e4..28ecf6aafe 100644
--- a/CRM/Utils/Money.php
+++ b/CRM/Utils/Money.php
@@ -1,7 +1,7 @@
 <?php
 /*
  +--------------------------------------------------------------------+
- | CiviCRM version 4.7                                                |
+ | CiviCRM version 5                                                  |
  +--------------------------------------------------------------------+
  | Copyright CiviCRM LLC (c) 2004-2018                                |
  +--------------------------------------------------------------------+
@@ -141,4 +141,17 @@ class CRM_Utils_Money {
     return 2;
   }
 
+  /**
+   * Subtract currencies using integers instead of floats, to preserve precision
+   *
+   * @return float
+   *   Result of subtracting $rightOp from $leftOp to the precision of $currency
+   */
+  public static function subtractCurrencies($leftOp, $rightOp, $currency) {
+    if (is_numeric($leftOp) && is_numeric($rightOp)) {
+      $precision = pow(10, self::getCurrencyPrecision($currency));
+      return (($leftOp * $precision) - ($rightOp * $precision)) / $precision;
+    }
+  }
+
 }